悬索桥主缆除湿的内部送气管道设计与性能

Design and performance of internal air supply conduit for dehumidification in main cables of suspension bridges

为满足在悬索桥主缆内部使用要求,设计了一种抗压和延伸性能均较好的干空气送气管道结构,采用数值模拟和试验测试的方法对送气管道的抗压性能及送气阻力特性进行了研究。结果表明:内径为50 mm、线径为5 mm、螺距为15~20 mm的304L不锈钢弹簧和波纹管组成的复合式送气管道能承受13.4 MPa的径向压应力作用,满足抗压强度要求;由弹簧和波纹管组成的复合式管道的送气阻力系数显著小于纯弹簧管道,最大可减小46.4%,即复合式送气管道可有效降低干空气输送过程中的压力损失。

In order to meet the requirements for use inside the main cables of suspension bridges,a dry air supply conduit structure with good compressive and extension properties is designed,and the compressive properties and air supply resistance characteristics of the air supply conduit are studied by numerical simulation and experimental testing.The results show that the composite air supply conduit composed of the 304L stainless steel spring with an inner diameter of 50 mm,wire diameter of 5 mm,pitch of 15~20 mm and the corrugated pipe can withstand the radial compressive stress of 13.4 MPa,thus meeting the compressive strength requirements.The air delivery resistance coefficient of the composite conduit composed of the spring and the corrugated pipe is significantly smaller than that of the pure spring conduit,with a maximum reduction of 46.4%,which means that the composite air supply conduit can effectively reduce the pressure loss in the process of dry air delivery.